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? ?? ??? ?? ?? ASP.NET MVC WeChat JS-SDK ?? ?? ????

ASP.NET MVC WeChat JS-SDK ?? ?? ????

Apr 25, 2017 am 11:31 AM
asp.net mvc ??

ASP.NET MVC微信JS-SDK認(rèn)證,具體內(nèi)容:

寫在前面

前陣子因?yàn)橛袀€項(xiàng)目需要做微信自定義分享功能,因而去研究了下微信JS-SDK相關(guān)知識。

此文做個簡單的記(tu)錄(cao)...

開始
所有的東西都從文檔開始:微信JSSDK說明文檔

項(xiàng)目需要用到的是分享接口 不過使用微信JS-SDK之前,需要做JS接口認(rèn)證。

認(rèn)證如下:

步驟一:綁定域名

步驟二:引入JS文件

步驟三:通過config接口注入權(quán)限驗(yàn)證配置

步驟四:通過ready接口處理成功驗(yàn)證

步驟五:通過error接口處理失敗驗(yàn)證

具體解釋:

步驟一中允許使用域名/子域名,只要xx.com/xxx.txt或者xx.com/mp/xxx.txt能訪問就好。域名認(rèn)證通過之后,此域名下的所有端口的網(wǎng)站都可以使用JS-SDK。

步驟二沒什么問題,略過。

步驟三最磨人,下面單獨(dú)講解。

config接口注入權(quán)限驗(yàn)證配置

先來一段說明:

所有需要使用JS-SDK的頁面必須先注入配置信息,否則將無法調(diào)用(同一個url僅需調(diào)用一次,對于變化url的SPA的web app可在每次url變化時(shí)進(jìn)行調(diào)用,目前Android微信客戶端不支持pushState的H5新特性,所以使用pushState來實(shí)現(xiàn)web app的頁面會導(dǎo)致簽名失敗,此問題會在Android6.2中修復(fù))。

wx.config({
 debug: true, // 開啟調(diào)試模式,調(diào)用的所有api的返回值會在客戶端alert出來,
 //若要查看傳入的參數(shù),可以在pc端打開,參數(shù)信息會通過log打出,僅在pc端時(shí)才會打印。
 appId: '', // 必填,公眾號的唯一標(biāo)識
 timestamp: , // 必填,生成簽名的時(shí)間戳
 nonceStr: '', // 必填,生成簽名的隨機(jī)串
 signature: '',// 必填,簽名,見附錄1
 jsApiList: [] // 必填,需要使用的JS接口列表,所有JS接口列表見附錄2
});

看到這里肯定懵逼了,這是都什么鬼...怎么玩啊。

提示我們?nèi)タ锤戒?...看完之后總結(jié)如下:

1.使用config接口注入權(quán)限驗(yàn)證配置,重點(diǎn)是生成合法的signatrue
2.生成signature需要通過appid和secret獲取token
3.時(shí)間戳和調(diào)用接口URL必不可少
4.此操作需要服務(wù)端完成,不能使用客戶端實(shí)現(xiàn)

整個過程變成:

1.通過appid和secret獲取access_token,接著使用token獲取jsapi_ticket;

2.拿到j(luò)sapi_ticket之后,把jsapi_ticket、時(shí)間戳、隨機(jī)字符串、接口調(diào)用頁面URL 拼接成完整字符串,使用sha1算法加密得到signature。

3.最后返回至頁面,在wx.config里面填入appid,上一步的時(shí)間戳timestamp,上一部的隨機(jī)字符串、sha1拿到的signature,想要使用的JS接口。

廢話少說,直接上代碼吧。

代碼時(shí)間

 public class WeiXinController : Controller
 {
 public static readonly string appid =
 System.Web.Configuration.WebConfigurationManager.AppSettings["wxappid"];

 public static readonly string secret =
 System.Web.Configuration.WebConfigurationManager.AppSettings["wxsecret"];

 public static readonly bool isDedug =
 System.Web.Configuration.WebConfigurationManager.AppSettings["IsDebug"] =="true";


 public static string _ticket = "";
 public static DateTime _lastTimestamp;

 public ActionResult Info(string url,string noncestr)
 {
  if (string.IsNullOrEmpty(_ticket) || 
  _lastTimestamp == null || (_lastTimestamp - DateTime.Now).Milliseconds > 7200)
  {
  var resultString = HTTPHelper.GetHTMLByURL("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid="
   + appid + "&secret=" + secret);
  dynamic resultValue = JsonConvert.DeserializeObject<dynamic>(resultString);
  if (resultValue == null || resultValue.access_token == null 
  || resultValue.access_token.Value == null)
  {
   return Json(new { issuccess = false, 
   error = "獲取token失敗" });
  }
  var token = resultValue.access_token.Value;

  resultString = HTTPHelper.GetHTMLByURL
  ("https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token=" + 
  token + "&type=jsapi");
  dynamic ticketValue = JsonConvert.DeserializeObject<dynamic>(resultString);
  if (ticketValue == null || ticketValue.errcode == null
  || ticketValue.errcode.Value != 0 || ticketValue.ticket == null)
   return Json(new { issuccess = false,
   error = "獲取ticketValue失敗" });
  _ticket = ticketValue.ticket.Value;
  _lastTimestamp = DateTime.Now;
  var timestamp = GetTimeStamp();
  var hexString = string.Format("jsapi_ticket={0}&noncestr={3}&timestamp={1}&url={2}",
  _ticket, timestamp, url,noncestr);

  return Json(new {
   issuccess = true, 
   sha1value = GetSHA1Value(hexString), 
   timestamp = timestamp, 
   url = url, 
   appid = appid, 
   debug=isDedug,
   tiket=_ticket
  });
  
  }
  else
  {
  var timestamp = GetTimeStamp();
  var hexString = string.Format("jsapi_ticket={0}&noncestr=1234567890123456&timestamp={1}&url={2}",
   _ticket, timestamp, url);
  return Json(new { 
   issuccess = true, sha1value = GetSHA1Value(hexString),
   timestamp = timestamp, url = url,
   appid = appid, debug = isDedug,tiket = _ticket
  });
  }
 }


 private string GetSHA1Value(string sourceString)
 {
  var hash = SHA1.Create().ComputeHash(Encoding.UTF8.GetBytes(sourceString));
  return string.Join("", 
  hash.Select(b => b.ToString("x2")).ToArray());
 }

 private static string GetTimeStamp()
 {

  TimeSpan ts = DateTime.Now - new DateTime(1970, 1, 1, 0, 0, 0, 0);

  return Convert.ToInt64(ts.TotalSeconds).ToString();

 }

 }
 
 public class HTTPHelper
 {
 public static string GetHTMLByURL(string url)
 {
  string htmlCode = string.Empty;
  try
  {
  HttpWebRequest webRequest = (System.Net.HttpWebRequest)System.Net.WebRequest.Create(url);
  webRequest.Timeout = 30000;
  webRequest.Method = "GET";
  webRequest.UserAgent = "Mozilla/4.0";
  webRequest.Headers.Add("Accept-Encoding", "gzip, deflate");
  HttpWebResponse webResponse = (System.Net.HttpWebResponse)webRequest.GetResponse();
  //獲取目標(biāo)網(wǎng)站的編碼格式
  string contentype = webResponse.Headers["Content-Type"];
  Regex regex = new Regex("charset\\s*=\\s*[\\W]?\\s*([\\w-]+)", RegexOptions.IgnoreCase);
  if (webResponse.ContentEncoding.ToLower() == "gzip")//如果使用了GZip則先解壓
  {
   using (System.IO.Stream streamReceive = webResponse.GetResponseStream())
   {
   using (var zipStream = new System.IO.Compression.GZipStream(streamReceive, System.IO.Compression.CompressionMode.Decompress))
   {
    //匹配編碼格式
    if (regex.IsMatch(contentype))
    {
    Encoding ending = Encoding.GetEncoding
    (regex.Match(contentype).Groups[1].Value.Trim());
    using (StreamReader sr = new System.IO.StreamReader(zipStream, ending))
    {
     htmlCode = sr.ReadToEnd();
    }
    }
    else
    {
    using (StreamReader sr = new System.IO.StreamReader(zipStream, Encoding.UTF8))
    {
     htmlCode = sr.ReadToEnd();
    }
    }
   }
   }
  }
  else
  {
   using (System.IO.Stream streamReceive = webResponse.GetResponseStream())
   {
   var encoding = Encoding.Default;
   if (contentype.Contains("utf"))
    encoding = Encoding.UTF8;
   using (System.IO.StreamReader sr = new System.IO.StreamReader(streamReceive, encoding))
   {
    htmlCode = sr.ReadToEnd();
   }

   }
  }
  return htmlCode;
  }
  catch (Exception ex)
  {
  return "";
  }
 }
 }

PS:這里要注意緩存一下_ticket(即access_token),照微信文檔說的,access_token兩個小時(shí)內(nèi)有效,不需要頻繁調(diào)用。而且獲取access_token的接口有調(diào)用次數(shù)的限制,如果超過了次數(shù),就不允許調(diào)用了。

PPS:建議noncestr和URL由前臺傳入比較適合,使用 var theWebUrl = window.location.href.split('#')[0] 獲取URL,noncestr就隨意了。

PPPS:遇到詭異的invalid signature的時(shí)候,首先檢查url參數(shù),然后檢查noncestr,再不行重啟一下程序獲取一個新的token回來繼續(xù)玩。

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